Hi,
I've written a patch for 2.4.28 kernel which enables writing of core
dump files for ELF binaries in .gz format. This is interesting when
using and debugging large binaries. In my case core files exceeded 1GB
and got written via NFS...
Anyhow, below patch is not really "beautiful", especially CRC looks
quite annoying here. Consequently it is to be seen as "proof of concept"
and I'm open for further discussion.
Is anybody else interested in something like this at all?
Regards,
Jan
diff -ur linux-2.4.28/arch/i386/config.in linux-2.4.28-patched/arch/i386/config.in
-- linux-2.4.28/arch/i386/config.in 2004-11-17 12:54:21.000000000 +0100
+++ linux-2.4.28-patched/arch/i386/config.in 2005-01-06 11:20:47.000000000 +0100
@@ -479,6 +479,7 @@
bool ' Magic SysRq key' CONFIG_MAGIC_SYSRQ
bool ' Spinlock debugging' CONFIG_DEBUG_SPINLOCK
bool ' Compile the kernel with frame pointers' CONFIG_FRAME_POINTER
+ bool ' Write gzipped core dump files' CONFIG_GZIP_COREDUMPS
fi
int 'Kernel messages buffer length shift (0 = default)' CONFIG_LOG_BUF_SHIFT 0
diff -ur linux-2.4.28/Documentation/Configure.help linux-2.4.28-patched/Documentation/Configure.help
-- linux-2.4.28/Documentation/Configure.help 2004-11-17 12:54:20.000000000 +0100
+++ linux-2.4.28-patched/Documentation/Configure.help 2005-01-06 11:21:56.000000000 +0100
@@ -29121,6 +29121,11 @@
If unsure, say N.
+CONFIG_GZIP_COREDUMPS
+ Saying yes here makes the kernel writing core dump files in a
+ gzipped compressed format. You will have to uncompress core files
+ with gzip -d prior to usage (e.g. with gdb).
+
#
# A couple of things I keep forgetting:
# capitalize: AppleTalk, Ethernet, DOS, DMA, FAT, FTP, Internet,
diff -ur linux-2.4.28/fs/binfmt_elf.c linux-2.4.28-patched/fs/binfmt_elf.c
-- linux-2.4.28/fs/binfmt_elf.c 2004-11-17 12:54:21.000000000 +0100
+++ linux-2.4.28-patched/fs/binfmt_elf.c 2005-01-06 11:19:47.000000000 +0100
@@ -9,6 +9,7 @@
* Copyright 1993, 1994: Eric Youngdale ([email protected]).
*/
+#include <linux/config.h>
#include <linux/module.h>
#include <linux/fs.h>
@@ -59,6 +60,533 @@
*/
#ifdef USE_ELF_CORE_DUMP
static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file);
+
+#ifdef CONFIG_GZIP_COREDUMPS
+
+/*
+ * Functions added to support writing core files in gzipped format, 2004
+ * Jan Frey <[email protected]>
+ */
+#include <linux/zlib.h>
+#include <linux/vmalloc.h>
+
+/* This table is needed for efficient CRC32 calculation */
+static const unsigned long crc_table[8][256] = {
+ {
+ 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
+ 0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL,
+ 0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL,
+ 0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL,
+ 0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL,
+ 0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL,
+ 0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL,
+ 0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL,
+ 0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL,
+ 0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL,
+ 0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL,
+ 0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL,
+ 0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL,
+ 0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL,
+ 0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL,
+ 0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL,
+ 0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL,
+ 0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL,
+ 0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL,
+ 0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL,
+ 0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL,
+ 0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL,
+ 0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL,
+ 0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL,
+ 0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL,
+ 0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL,
+ 0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL,
+ 0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL,
+ 0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL,
+ 0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL,
+ 0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL,
+ 0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL,
+ 0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL,
+ 0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL,
+ 0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL,
+ 0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL,
+ 0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL,
+ 0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL,
+ 0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL,
+ 0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL,
+ 0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL,
+ 0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL,
+ 0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL,
+ 0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL,
+ 0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL,
+ 0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL,
+ 0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL,
+ 0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL,
+ 0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL,
+ 0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL,
+ 0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL,
+ 0x2d02ef8dUL
+ },
+ {
+ 0x00000000UL, 0x191b3141UL, 0x32366282UL, 0x2b2d53c3UL, 0x646cc504UL,
+ 0x7d77f445UL, 0x565aa786UL, 0x4f4196c7UL, 0xc8d98a08UL, 0xd1c2bb49UL,
+ 0xfaefe88aUL, 0xe3f4d9cbUL, 0xacb54f0cUL, 0xb5ae7e4dUL, 0x9e832d8eUL,
+ 0x87981ccfUL, 0x4ac21251UL, 0x53d92310UL, 0x78f470d3UL, 0x61ef4192UL,
+ 0x2eaed755UL, 0x37b5e614UL, 0x1c98b5d7UL, 0x05838496UL, 0x821b9859UL,
+ 0x9b00a918UL, 0xb02dfadbUL, 0xa936cb9aUL, 0xe6775d5dUL, 0xff6c6c1cUL,
+ 0xd4413fdfUL, 0xcd5a0e9eUL, 0x958424a2UL, 0x8c9f15e3UL, 0xa7b24620UL,
+ 0xbea97761UL, 0xf1e8e1a6UL, 0xe8f3d0e7UL, 0xc3de8324UL, 0xdac5b265UL,
+ 0x5d5daeaaUL, 0x44469febUL, 0x6f6bcc28UL, 0x7670fd69UL, 0x39316baeUL,
+ 0x202a5aefUL, 0x0b07092cUL, 0x121c386dUL, 0xdf4636f3UL, 0xc65d07b2UL,
+ 0xed705471UL, 0xf46b6530UL, 0xbb2af3f7UL, 0xa231c2b6UL, 0x891c9175UL,
+ 0x9007a034UL, 0x179fbcfbUL, 0x0e848dbaUL, 0x25a9de79UL, 0x3cb2ef38UL,
+ 0x73f379ffUL, 0x6ae848beUL, 0x41c51b7dUL, 0x58de2a3cUL, 0xf0794f05UL,
+ 0xe9627e44UL, 0xc24f2d87UL, 0xdb541cc6UL, 0x94158a01UL, 0x8d0ebb40UL,
+ 0xa623e883UL, 0xbf38d9c2UL, 0x38a0c50dUL, 0x21bbf44cUL, 0x0a96a78fUL,
+ 0x138d96ceUL, 0x5ccc0009UL, 0x45d73148UL, 0x6efa628bUL, 0x77e153caUL,
+ 0xbabb5d54UL, 0xa3a06c15UL, 0x888d3fd6UL, 0x91960e97UL, 0xded79850UL,
+ 0xc7cca911UL, 0xece1fad2UL, 0xf5facb93UL, 0x7262d75cUL, 0x6b79e61dUL,
+ 0x4054b5deUL, 0x594f849fUL, 0x160e1258UL, 0x0f152319UL, 0x243870daUL,
+ 0x3d23419bUL, 0x65fd6ba7UL, 0x7ce65ae6UL, 0x57cb0925UL, 0x4ed03864UL,
+ 0x0191aea3UL, 0x188a9fe2UL, 0x33a7cc21UL, 0x2abcfd60UL, 0xad24e1afUL,
+ 0xb43fd0eeUL, 0x9f12832dUL, 0x8609b26cUL, 0xc94824abUL, 0xd05315eaUL,
+ 0xfb7e4629UL, 0xe2657768UL, 0x2f3f79f6UL, 0x362448b7UL, 0x1d091b74UL,
+ 0x04122a35UL, 0x4b53bcf2UL, 0x52488db3UL, 0x7965de70UL, 0x607eef31UL,
+ 0xe7e6f3feUL, 0xfefdc2bfUL, 0xd5d0917cUL, 0xcccba03dUL, 0x838a36faUL,
+ 0x9a9107bbUL, 0xb1bc5478UL, 0xa8a76539UL, 0x3b83984bUL, 0x2298a90aUL,
+ 0x09b5fac9UL, 0x10aecb88UL, 0x5fef5d4fUL, 0x46f46c0eUL, 0x6dd93fcdUL,
+ 0x74c20e8cUL, 0xf35a1243UL, 0xea412302UL, 0xc16c70c1UL, 0xd8774180UL,
+ 0x9736d747UL, 0x8e2de606UL, 0xa500b5c5UL, 0xbc1b8484UL, 0x71418a1aUL,
+ 0x685abb5bUL, 0x4377e898UL, 0x5a6cd9d9UL, 0x152d4f1eUL, 0x0c367e5fUL,
+ 0x271b2d9cUL, 0x3e001cddUL, 0xb9980012UL, 0xa0833153UL, 0x8bae6290UL,
+ 0x92b553d1UL, 0xddf4c516UL, 0xc4eff457UL, 0xefc2a794UL, 0xf6d996d5UL,
+ 0xae07bce9UL, 0xb71c8da8UL, 0x9c31de6bUL, 0x852aef2aUL, 0xca6b79edUL,
+ 0xd37048acUL, 0xf85d1b6fUL, 0xe1462a2eUL, 0x66de36e1UL, 0x7fc507a0UL,
+ 0x54e85463UL, 0x4df36522UL, 0x02b2f3e5UL, 0x1ba9c2a4UL, 0x30849167UL,
+ 0x299fa026UL, 0xe4c5aeb8UL, 0xfdde9ff9UL, 0xd6f3cc3aUL, 0xcfe8fd7bUL,
+ 0x80a96bbcUL, 0x99b25afdUL, 0xb29f093eUL, 0xab84387fUL, 0x2c1c24b0UL,
+ 0x350715f1UL, 0x1e2a4632UL, 0x07317773UL, 0x4870e1b4UL, 0x516bd0f5UL,
+ 0x7a468336UL, 0x635db277UL, 0xcbfad74eUL, 0xd2e1e60fUL, 0xf9ccb5ccUL,
+ 0xe0d7848dUL, 0xaf96124aUL, 0xb68d230bUL, 0x9da070c8UL, 0x84bb4189UL,
+ 0x03235d46UL, 0x1a386c07UL, 0x31153fc4UL, 0x280e0e85UL, 0x674f9842UL,
+ 0x7e54a903UL, 0x5579fac0UL, 0x4c62cb81UL, 0x8138c51fUL, 0x9823f45eUL,
+ 0xb30ea79dUL, 0xaa1596dcUL, 0xe554001bUL, 0xfc4f315aUL, 0xd7626299UL,
+ 0xce7953d8UL, 0x49e14f17UL, 0x50fa7e56UL, 0x7bd72d95UL, 0x62cc1cd4UL,
+ 0x2d8d8a13UL, 0x3496bb52UL, 0x1fbbe891UL, 0x06a0d9d0UL, 0x5e7ef3ecUL,
+ 0x4765c2adUL, 0x6c48916eUL, 0x7553a02fUL, 0x3a1236e8UL, 0x230907a9UL,
+ 0x0824546aUL, 0x113f652bUL, 0x96a779e4UL, 0x8fbc48a5UL, 0xa4911b66UL,
+ 0xbd8a2a27UL, 0xf2cbbce0UL, 0xebd08da1UL, 0xc0fdde62UL, 0xd9e6ef23UL,
+ 0x14bce1bdUL, 0x0da7d0fcUL, 0x268a833fUL, 0x3f91b27eUL, 0x70d024b9UL,
+ 0x69cb15f8UL, 0x42e6463bUL, 0x5bfd777aUL, 0xdc656bb5UL, 0xc57e5af4UL,
+ 0xee530937UL, 0xf7483876UL, 0xb809aeb1UL, 0xa1129ff0UL, 0x8a3fcc33UL,
+ 0x9324fd72UL
+ },
+ {
+ 0x00000000UL, 0x01c26a37UL, 0x0384d46eUL, 0x0246be59UL, 0x0709a8dcUL,
+ 0x06cbc2ebUL, 0x048d7cb2UL, 0x054f1685UL, 0x0e1351b8UL, 0x0fd13b8fUL,
+ 0x0d9785d6UL, 0x0c55efe1UL, 0x091af964UL, 0x08d89353UL, 0x0a9e2d0aUL,
+ 0x0b5c473dUL, 0x1c26a370UL, 0x1de4c947UL, 0x1fa2771eUL, 0x1e601d29UL,
+ 0x1b2f0bacUL, 0x1aed619bUL, 0x18abdfc2UL, 0x1969b5f5UL, 0x1235f2c8UL,
+ 0x13f798ffUL, 0x11b126a6UL, 0x10734c91UL, 0x153c5a14UL, 0x14fe3023UL,
+ 0x16b88e7aUL, 0x177ae44dUL, 0x384d46e0UL, 0x398f2cd7UL, 0x3bc9928eUL,
+ 0x3a0bf8b9UL, 0x3f44ee3cUL, 0x3e86840bUL, 0x3cc03a52UL, 0x3d025065UL,
+ 0x365e1758UL, 0x379c7d6fUL, 0x35dac336UL, 0x3418a901UL, 0x3157bf84UL,
+ 0x3095d5b3UL, 0x32d36beaUL, 0x331101ddUL, 0x246be590UL, 0x25a98fa7UL,
+ 0x27ef31feUL, 0x262d5bc9UL, 0x23624d4cUL, 0x22a0277bUL, 0x20e69922UL,
+ 0x2124f315UL, 0x2a78b428UL, 0x2bbade1fUL, 0x29fc6046UL, 0x283e0a71UL,
+ 0x2d711cf4UL, 0x2cb376c3UL, 0x2ef5c89aUL, 0x2f37a2adUL, 0x709a8dc0UL,
+ 0x7158e7f7UL, 0x731e59aeUL, 0x72dc3399UL, 0x7793251cUL, 0x76514f2bUL,
+ 0x7417f172UL, 0x75d59b45UL, 0x7e89dc78UL, 0x7f4bb64fUL, 0x7d0d0816UL,
+ 0x7ccf6221UL, 0x798074a4UL, 0x78421e93UL, 0x7a04a0caUL, 0x7bc6cafdUL,
+ 0x6cbc2eb0UL, 0x6d7e4487UL, 0x6f38fadeUL, 0x6efa90e9UL, 0x6bb5866cUL,
+ 0x6a77ec5bUL, 0x68315202UL, 0x69f33835UL, 0x62af7f08UL, 0x636d153fUL,
+ 0x612bab66UL, 0x60e9c151UL, 0x65a6d7d4UL, 0x6464bde3UL, 0x662203baUL,
+ 0x67e0698dUL, 0x48d7cb20UL, 0x4915a117UL, 0x4b531f4eUL, 0x4a917579UL,
+ 0x4fde63fcUL, 0x4e1c09cbUL, 0x4c5ab792UL, 0x4d98dda5UL, 0x46c49a98UL,
+ 0x4706f0afUL, 0x45404ef6UL, 0x448224c1UL, 0x41cd3244UL, 0x400f5873UL,
+ 0x4249e62aUL, 0x438b8c1dUL, 0x54f16850UL, 0x55330267UL, 0x5775bc3eUL,
+ 0x56b7d609UL, 0x53f8c08cUL, 0x523aaabbUL, 0x507c14e2UL, 0x51be7ed5UL,
+ 0x5ae239e8UL, 0x5b2053dfUL, 0x5966ed86UL, 0x58a487b1UL, 0x5deb9134UL,
+ 0x5c29fb03UL, 0x5e6f455aUL, 0x5fad2f6dUL, 0xe1351b80UL, 0xe0f771b7UL,
+ 0xe2b1cfeeUL, 0xe373a5d9UL, 0xe63cb35cUL, 0xe7fed96bUL, 0xe5b86732UL,
+ 0xe47a0d05UL, 0xef264a38UL, 0xeee4200fUL, 0xeca29e56UL, 0xed60f461UL,
+ 0xe82fe2e4UL, 0xe9ed88d3UL, 0xebab368aUL, 0xea695cbdUL, 0xfd13b8f0UL,
+ 0xfcd1d2c7UL, 0xfe976c9eUL, 0xff5506a9UL, 0xfa1a102cUL, 0xfbd87a1bUL,
+ 0xf99ec442UL, 0xf85cae75UL, 0xf300e948UL, 0xf2c2837fUL, 0xf0843d26UL,
+ 0xf1465711UL, 0xf4094194UL, 0xf5cb2ba3UL, 0xf78d95faUL, 0xf64fffcdUL,
+ 0xd9785d60UL, 0xd8ba3757UL, 0xdafc890eUL, 0xdb3ee339UL, 0xde71f5bcUL,
+ 0xdfb39f8bUL, 0xddf521d2UL, 0xdc374be5UL, 0xd76b0cd8UL, 0xd6a966efUL,
+ 0xd4efd8b6UL, 0xd52db281UL, 0xd062a404UL, 0xd1a0ce33UL, 0xd3e6706aUL,
+ 0xd2241a5dUL, 0xc55efe10UL, 0xc49c9427UL, 0xc6da2a7eUL, 0xc7184049UL,
+ 0xc25756ccUL, 0xc3953cfbUL, 0xc1d382a2UL, 0xc011e895UL, 0xcb4dafa8UL,
+ 0xca8fc59fUL, 0xc8c97bc6UL, 0xc90b11f1UL, 0xcc440774UL, 0xcd866d43UL,
+ 0xcfc0d31aUL, 0xce02b92dUL, 0x91af9640UL, 0x906dfc77UL, 0x922b422eUL,
+ 0x93e92819UL, 0x96a63e9cUL, 0x976454abUL, 0x9522eaf2UL, 0x94e080c5UL,
+ 0x9fbcc7f8UL, 0x9e7eadcfUL, 0x9c381396UL, 0x9dfa79a1UL, 0x98b56f24UL,
+ 0x99770513UL, 0x9b31bb4aUL, 0x9af3d17dUL, 0x8d893530UL, 0x8c4b5f07UL,
+ 0x8e0de15eUL, 0x8fcf8b69UL, 0x8a809decUL, 0x8b42f7dbUL, 0x89044982UL,
+ 0x88c623b5UL, 0x839a6488UL, 0x82580ebfUL, 0x801eb0e6UL, 0x81dcdad1UL,
+ 0x8493cc54UL, 0x8551a663UL, 0x8717183aUL, 0x86d5720dUL, 0xa9e2d0a0UL,
+ 0xa820ba97UL, 0xaa6604ceUL, 0xaba46ef9UL, 0xaeeb787cUL, 0xaf29124bUL,
+ 0xad6fac12UL, 0xacadc625UL, 0xa7f18118UL, 0xa633eb2fUL, 0xa4755576UL,
+ 0xa5b73f41UL, 0xa0f829c4UL, 0xa13a43f3UL, 0xa37cfdaaUL, 0xa2be979dUL,
+ 0xb5c473d0UL, 0xb40619e7UL, 0xb640a7beUL, 0xb782cd89UL, 0xb2cddb0cUL,
+ 0xb30fb13bUL, 0xb1490f62UL, 0xb08b6555UL, 0xbbd72268UL, 0xba15485fUL,
+ 0xb853f606UL, 0xb9919c31UL, 0xbcde8ab4UL, 0xbd1ce083UL, 0xbf5a5edaUL,
+ 0xbe9834edUL
+ },
+ {
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+ 0x66ab2b61UL, 0x51c1e960UL, 0xd4d7a665UL, 0xe3bd6464UL, 0xba032266UL,
+ 0x8d69e067UL, 0x20cbd748UL, 0x17a11549UL, 0x4e1f534bUL, 0x7975914aUL,
+ 0xfc63de4fUL, 0xcb091c4eUL, 0x92b75a4cUL, 0xa5dd984dUL, 0x989ac446UL,
+ 0xaff00647UL, 0xf64e4045UL, 0xc1248244UL, 0x4432cd41UL, 0x73580f40UL,
+ 0x2ae64942UL, 0x1d8c8b43UL, 0x5068f154UL, 0x67023355UL, 0x3ebc7557UL,
+ 0x09d6b756UL, 0x8cc0f853UL, 0xbbaa3a52UL, 0xe2147c50UL, 0xd57ebe51UL,
+ 0xe839e25aUL, 0xdf53205bUL, 0x86ed6659UL, 0xb187a458UL, 0x3491eb5dUL,
+ 0x03fb295cUL, 0x5a456f5eUL, 0x6d2fad5fUL, 0x801b35e1UL, 0xb771f7e0UL,
+ 0xeecfb1e2UL, 0xd9a573e3UL, 0x5cb33ce6UL, 0x6bd9fee7UL, 0x3267b8e5UL,
+ 0x050d7ae4UL, 0x384a26efUL, 0x0f20e4eeUL, 0x569ea2ecUL, 0x61f460edUL,
+ 0xe4e22fe8UL, 0xd388ede9UL, 0x8a36abebUL, 0xbd5c69eaUL, 0xf0b813fdUL,
+ 0xc7d2d1fcUL, 0x9e6c97feUL, 0xa90655ffUL, 0x2c101afaUL, 0x1b7ad8fbUL,
+ 0x42c49ef9UL, 0x75ae5cf8UL, 0x48e900f3UL, 0x7f83c2f2UL, 0x263d84f0UL,
+ 0x115746f1UL, 0x944109f4UL, 0xa32bcbf5UL, 0xfa958df7UL, 0xcdff4ff6UL,
+ 0x605d78d9UL, 0x5737bad8UL, 0x0e89fcdaUL, 0x39e33edbUL, 0xbcf571deUL,
+ 0x8b9fb3dfUL, 0xd221f5ddUL, 0xe54b37dcUL, 0xd80c6bd7UL, 0xef66a9d6UL,
+ 0xb6d8efd4UL, 0x81b22dd5UL, 0x04a462d0UL, 0x33cea0d1UL, 0x6a70e6d3UL,
+ 0x5d1a24d2UL, 0x10fe5ec5UL, 0x27949cc4UL, 0x7e2adac6UL, 0x494018c7UL,
+ 0xcc5657c2UL, 0xfb3c95c3UL, 0xa282d3c1UL, 0x95e811c0UL, 0xa8af4dcbUL,
+ 0x9fc58fcaUL, 0xc67bc9c8UL, 0xf1110bc9UL, 0x740744ccUL, 0x436d86cdUL,
+ 0x1ad3c0cfUL, 0x2db902ceUL, 0x4096af91UL, 0x77fc6d90UL, 0x2e422b92UL,
+ 0x1928e993UL, 0x9c3ea696UL, 0xab546497UL, 0xf2ea2295UL, 0xc580e094UL,
+ 0xf8c7bc9fUL, 0xcfad7e9eUL, 0x9613389cUL, 0xa179fa9dUL, 0x246fb598UL,
+ 0x13057799UL, 0x4abb319bUL, 0x7dd1f39aUL, 0x3035898dUL, 0x075f4b8cUL,
+ 0x5ee10d8eUL, 0x698bcf8fUL, 0xec9d808aUL, 0xdbf7428bUL, 0x82490489UL,
+ 0xb523c688UL, 0x88649a83UL, 0xbf0e5882UL, 0xe6b01e80UL, 0xd1dadc81UL,
+ 0x54cc9384UL, 0x63a65185UL, 0x3a181787UL, 0x0d72d586UL, 0xa0d0e2a9UL,
+ 0x97ba20a8UL, 0xce0466aaUL, 0xf96ea4abUL, 0x7c78ebaeUL, 0x4b1229afUL,
+ 0x12ac6fadUL, 0x25c6adacUL, 0x1881f1a7UL, 0x2feb33a6UL, 0x765575a4UL,
+ 0x413fb7a5UL, 0xc429f8a0UL, 0xf3433aa1UL, 0xaafd7ca3UL, 0x9d97bea2UL,
+ 0xd073c4b5UL, 0xe71906b4UL, 0xbea740b6UL, 0x89cd82b7UL, 0x0cdbcdb2UL,
+ 0x3bb10fb3UL, 0x620f49b1UL, 0x55658bb0UL, 0x6822d7bbUL, 0x5f4815baUL,
+ 0x06f653b8UL, 0x319c91b9UL, 0xb48adebcUL, 0x83e01cbdUL, 0xda5e5abfUL,
+ 0xed3498beUL
+ },
+ {
+ 0x00000000UL, 0x6567bcb8UL, 0x8bc809aaUL, 0xeeafb512UL, 0x5797628fUL,
+ 0x32f0de37UL, 0xdc5f6b25UL, 0xb938d79dUL, 0xef28b4c5UL, 0x8a4f087dUL,
+ 0x64e0bd6fUL, 0x018701d7UL, 0xb8bfd64aUL, 0xddd86af2UL, 0x3377dfe0UL,
+ 0x56106358UL, 0x9f571950UL, 0xfa30a5e8UL, 0x149f10faUL, 0x71f8ac42UL,
+ 0xc8c07bdfUL, 0xada7c767UL, 0x43087275UL, 0x266fcecdUL, 0x707fad95UL,
+ 0x1518112dUL, 0xfbb7a43fUL, 0x9ed01887UL, 0x27e8cf1aUL, 0x428f73a2UL,
+ 0xac20c6b0UL, 0xc9477a08UL, 0x3eaf32a0UL, 0x5bc88e18UL, 0xb5673b0aUL,
+ 0xd00087b2UL, 0x6938502fUL, 0x0c5fec97UL, 0xe2f05985UL, 0x8797e53dUL,
+ 0xd1878665UL, 0xb4e03addUL, 0x5a4f8fcfUL, 0x3f283377UL, 0x8610e4eaUL,
+ 0xe3775852UL, 0x0dd8ed40UL, 0x68bf51f8UL, 0xa1f82bf0UL, 0xc49f9748UL,
+ 0x2a30225aUL, 0x4f579ee2UL, 0xf66f497fUL, 0x9308f5c7UL, 0x7da740d5UL,
+ 0x18c0fc6dUL, 0x4ed09f35UL, 0x2bb7238dUL, 0xc518969fUL, 0xa07f2a27UL,
+ 0x1947fdbaUL, 0x7c204102UL, 0x928ff410UL, 0xf7e848a8UL, 0x3d58149bUL,
+ 0x583fa823UL, 0xb6901d31UL, 0xd3f7a189UL, 0x6acf7614UL, 0x0fa8caacUL,
+ 0xe1077fbeUL, 0x8460c306UL, 0xd270a05eUL, 0xb7171ce6UL, 0x59b8a9f4UL,
+ 0x3cdf154cUL, 0x85e7c2d1UL, 0xe0807e69UL, 0x0e2fcb7bUL, 0x6b4877c3UL,
+ 0xa20f0dcbUL, 0xc768b173UL, 0x29c70461UL, 0x4ca0b8d9UL, 0xf5986f44UL,
+ 0x90ffd3fcUL, 0x7e5066eeUL, 0x1b37da56UL, 0x4d27b90eUL, 0x284005b6UL,
+ 0xc6efb0a4UL, 0xa3880c1cUL, 0x1ab0db81UL, 0x7fd76739UL, 0x9178d22bUL,
+ 0xf41f6e93UL, 0x03f7263bUL, 0x66909a83UL, 0x883f2f91UL, 0xed589329UL,
+ 0x546044b4UL, 0x3107f80cUL, 0xdfa84d1eUL, 0xbacff1a6UL, 0xecdf92feUL,
+ 0x89b82e46UL, 0x67179b54UL, 0x027027ecUL, 0xbb48f071UL, 0xde2f4cc9UL,
+ 0x3080f9dbUL, 0x55e74563UL, 0x9ca03f6bUL, 0xf9c783d3UL, 0x176836c1UL,
+ 0x720f8a79UL, 0xcb375de4UL, 0xae50e15cUL, 0x40ff544eUL, 0x2598e8f6UL,
+ 0x73888baeUL, 0x16ef3716UL, 0xf8408204UL, 0x9d273ebcUL, 0x241fe921UL,
+ 0x41785599UL, 0xafd7e08bUL, 0xcab05c33UL, 0x3bb659edUL, 0x5ed1e555UL,
+ 0xb07e5047UL, 0xd519ecffUL, 0x6c213b62UL, 0x094687daUL, 0xe7e932c8UL,
+ 0x828e8e70UL, 0xd49eed28UL, 0xb1f95190UL, 0x5f56e482UL, 0x3a31583aUL,
+ 0x83098fa7UL, 0xe66e331fUL, 0x08c1860dUL, 0x6da63ab5UL, 0xa4e140bdUL,
+ 0xc186fc05UL, 0x2f294917UL, 0x4a4ef5afUL, 0xf3762232UL, 0x96119e8aUL,
+ 0x78be2b98UL, 0x1dd99720UL, 0x4bc9f478UL, 0x2eae48c0UL, 0xc001fdd2UL,
+ 0xa566416aUL, 0x1c5e96f7UL, 0x79392a4fUL, 0x97969f5dUL, 0xf2f123e5UL,
+ 0x05196b4dUL, 0x607ed7f5UL, 0x8ed162e7UL, 0xebb6de5fUL, 0x528e09c2UL,
+ 0x37e9b57aUL, 0xd9460068UL, 0xbc21bcd0UL, 0xea31df88UL, 0x8f566330UL,
+ 0x61f9d622UL, 0x049e6a9aUL, 0xbda6bd07UL, 0xd8c101bfUL, 0x366eb4adUL,
+ 0x53090815UL, 0x9a4e721dUL, 0xff29cea5UL, 0x11867bb7UL, 0x74e1c70fUL,
+ 0xcdd91092UL, 0xa8beac2aUL, 0x46111938UL, 0x2376a580UL, 0x7566c6d8UL,
+ 0x10017a60UL, 0xfeaecf72UL, 0x9bc973caUL, 0x22f1a457UL, 0x479618efUL,
+ 0xa939adfdUL, 0xcc5e1145UL, 0x06ee4d76UL, 0x6389f1ceUL, 0x8d2644dcUL,
+ 0xe841f864UL, 0x51792ff9UL, 0x341e9341UL, 0xdab12653UL, 0xbfd69aebUL,
+ 0xe9c6f9b3UL, 0x8ca1450bUL, 0x620ef019UL, 0x07694ca1UL, 0xbe519b3cUL,
+ 0xdb362784UL, 0x35999296UL, 0x50fe2e2eUL, 0x99b95426UL, 0xfcdee89eUL,
+ 0x12715d8cUL, 0x7716e134UL, 0xce2e36a9UL, 0xab498a11UL, 0x45e63f03UL,
+ 0x208183bbUL, 0x7691e0e3UL, 0x13f65c5bUL, 0xfd59e949UL, 0x983e55f1UL,
+ 0x2106826cUL, 0x44613ed4UL, 0xaace8bc6UL, 0xcfa9377eUL, 0x38417fd6UL,
+ 0x5d26c36eUL, 0xb389767cUL, 0xd6eecac4UL, 0x6fd61d59UL, 0x0ab1a1e1UL,
+ 0xe41e14f3UL, 0x8179a84bUL, 0xd769cb13UL, 0xb20e77abUL, 0x5ca1c2b9UL,
+ 0x39c67e01UL, 0x80fea99cUL, 0xe5991524UL, 0x0b36a036UL, 0x6e511c8eUL,
+ 0xa7166686UL, 0xc271da3eUL, 0x2cde6f2cUL, 0x49b9d394UL, 0xf0810409UL,
+ 0x95e6b8b1UL, 0x7b490da3UL, 0x1e2eb11bUL, 0x483ed243UL, 0x2d596efbUL,
+ 0xc3f6dbe9UL, 0xa6916751UL, 0x1fa9b0ccUL, 0x7ace0c74UL, 0x9461b966UL,
+ 0xf10605deUL
+ }
+};
+
+static __u32 crc32 (__u32 crc, const unsigned char *buf, unsigned len)
+{
+ __u32 c;
+ const __u32 *buf4;
+
+ if (buf == 0)
+ return 0UL; /* init */
+
+ c = ~crc;
+ while (len && ((int)buf & 3)) {
+ c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
+ len--;
+ }
+
+ buf4 = (const __u32 *)buf;
+
+ while (len >= 32) {
+ c ^= *buf4++;
+ c = crc_table[3][c & 0xff] ^
+ crc_table[2][(c >> 8) & 0xff] ^
+ crc_table[1][(c >> 16) & 0xff] ^
+ crc_table[0][c >> 24];
+ c ^= *buf4++;
+ c = crc_table[3][c & 0xff] ^
+ crc_table[2][(c >> 8) & 0xff] ^
+ crc_table[1][(c >> 16) & 0xff] ^
+ crc_table[0][c >> 24];
+ c ^= *buf4++;
+ c = crc_table[3][c & 0xff] ^
+ crc_table[2][(c >> 8) & 0xff] ^
+ crc_table[1][(c >> 16) & 0xff] ^
+ crc_table[0][c >> 24];
+ c ^= *buf4++;
+ c = crc_table[3][c & 0xff] ^
+ crc_table[2][(c >> 8) & 0xff] ^
+ crc_table[1][(c >> 16) & 0xff] ^
+ crc_table[0][c >> 24];
+ c ^= *buf4++;
+ c = crc_table[3][c & 0xff] ^
+ crc_table[2][(c >> 8) & 0xff] ^
+ crc_table[1][(c >> 16) & 0xff] ^
+ crc_table[0][c >> 24];
+ c ^= *buf4++;
+ c = crc_table[3][c & 0xff] ^
+ crc_table[2][(c >> 8) & 0xff] ^
+ crc_table[1][(c >> 16) & 0xff] ^
+ crc_table[0][c >> 24];
+ c ^= *buf4++;
+ c = crc_table[3][c & 0xff] ^
+ crc_table[2][(c >> 8) & 0xff] ^
+ crc_table[1][(c >> 16) & 0xff] ^
+ crc_table[0][c >> 24];
+ c ^= *buf4++;
+ c = crc_table[3][c & 0xff] ^
+ crc_table[2][(c >> 8) & 0xff] ^
+ crc_table[1][(c >> 16) & 0xff] ^
+ crc_table[0][c >> 24];
+
+ len -= 32;
+ }
+
+ while (len >= 4) {
+ c ^= *buf4++;
+ c = crc_table[3][c & 0xff] ^
+ crc_table[2][(c >> 8) & 0xff] ^
+ crc_table[1][(c >> 16) & 0xff] ^
+ crc_table[0][c >> 24];
+ len -= 4;
+ }
+
+ buf = (const unsigned char *)buf4;
+
+ if (len) do {
+ c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
+ } while (--len);
+
+ c = ~c;
+ return c;
+}
+#endif
+
#else
#define elf_core_dump NULL
#endif
@@ -941,15 +1469,83 @@
* Modelled on fs/exec.c:aout_core_dump()
* Jeremy Fitzhardinge <[email protected]>
*/
+#ifdef CONFIG_GZIP_COREDUMPS
/*
- * These are the only things you should do on a core-file: use only these
- * functions to write out all the necessary info.
+ * gz writing support
+ * Jan Frey <[email protected]>
*/
-static int dump_write(struct file *file, const void *addr, int nr)
+static int gz_dump_write(struct file *file, const void *addr, int nr, __u32 *crc, z_streamp zstr)
{
- return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+ const int OUT_BUF_SIZE = 100*1024;
+ int all_fine = 1;
+ void *out_buf = vmalloc(OUT_BUF_SIZE);
+
+ if (!out_buf) {
+ printk(KERN_WARNING "Failed to allocate deflate buffer");
+ return 0;
+ }
+
+ *crc = crc32 (*crc, addr, nr);
+
+ zstr->next_in = addr;
+ zstr->avail_in = nr;
+
+ do {
+ zstr->next_out = out_buf;
+ zstr->avail_out = OUT_BUF_SIZE;
+
+ if (zlib_deflate (zstr, Z_NO_FLUSH) == Z_OK) {
+ /* new output generated */
+ all_fine = (file->f_op->write (file,
+ out_buf,
+ OUT_BUF_SIZE - zstr->avail_out,
+ &file->f_pos)
+ == (OUT_BUF_SIZE - zstr->avail_out));
+ }
+ } while ((zstr->avail_out != OUT_BUF_SIZE) && all_fine);
+
+ vfree (out_buf);
+ return all_fine;
}
+static int gz_finish (struct file *file, z_streamp zstr)
+{
+ const int OUT_BUF_SIZE = 100*1024;
+ int all_fine = 1;
+ int ret;
+ void *out_buf = vmalloc(OUT_BUF_SIZE);
+
+ if (!out_buf) {
+ printk(KERN_WARNING "Failed to allocate deflate buffer");
+ return 0;
+ }
+
+ zstr->next_in = 0;
+ zstr->avail_in = 0;
+
+ do {
+ zstr->next_out = out_buf;
+ zstr->avail_out = OUT_BUF_SIZE;
+
+ ret = zlib_deflate (zstr, Z_FINISH);
+ if ((ret == Z_OK) || (ret == Z_STREAM_END)) {
+ /* new output generated */
+ all_fine = (file->f_op->write (file,
+ out_buf,
+ OUT_BUF_SIZE - zstr->avail_out,
+ &file->f_pos)
+ == (OUT_BUF_SIZE - zstr->avail_out));
+ }
+ } while ((zstr->avail_out != OUT_BUF_SIZE) && all_fine && (ret != Z_STREAM_END));
+
+ vfree (out_buf);
+ return all_fine;
+}
+#else
+/*
+ * These are the only things you should do on a core-file: use only these
+ * functions to write out all the necessary info.
+ */
static int dump_seek(struct file *file, off_t off)
{
if (file->f_op->llseek) {
@@ -959,6 +1555,13 @@
file->f_pos = off;
return 1;
}
+#endif
+
+static int dump_write(struct file *file, const void *addr, int nr)
+{
+ return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+}
+
/*
* Decide whether a segment is worth dumping; default is yes to be
@@ -1030,11 +1633,54 @@
}
#endif
-#define DUMP_WRITE(addr, nr) \
- do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
+#ifdef CONFIG_GZIP_COREDUMPS
+#define PAD_GZ(nr, buf, crc, str) \
+ do { \
+ int cur=(nr); \
+ while (cur>1024) { \
+ gz_dump_write(file, (buf), 1024, (crc), (str)); \
+ cur-=1024; \
+ } \
+ if (cur) { \
+ gz_dump_write(file, (buf), cur, (crc), (str)); \
+ } \
+ } while(0)
+
+#define DUMP_GZ(addr, nr, crc, str) \
+ do { if (!gz_dump_write(file, (addr), (nr), (crc), (str))) return 0; } while(0)
+#else
#define DUMP_SEEK(off) \
do { if (!dump_seek(file, (off))) return 0; } while(0)
+#endif
+
+#define DUMP_WRITE(addr, nr) \
+ do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
+
+#ifdef CONFIG_GZIP_COREDUMPS
+static int writenote_gz(struct memelfnote *men, struct file *file, char *buf, __u32 *crc, z_streamp zstr)
+{
+ struct elf_note en;
+ int dummy_bytes;
+
+ en.n_namesz = strlen(men->name);
+ en.n_descsz = men->datasz;
+ en.n_type = men->type;
+ DUMP_GZ(&en, sizeof(en), crc, zstr);
+ DUMP_GZ(men->name, en.n_namesz, crc, zstr);
+
+ dummy_bytes = roundup((unsigned long)zstr->total_in, 4) - zstr->total_in;
+ PAD_GZ(dummy_bytes, buf, crc, zstr);
+
+ DUMP_GZ(men->data, men->datasz, crc, zstr);
+
+ dummy_bytes = roundup((unsigned long)zstr->total_in, 4) - zstr->total_in;
+ PAD_GZ(dummy_bytes, buf, crc, zstr);
+
+ return 1;
+}
+#undef DUMP_GZ
+#else
static int writenote(struct memelfnote *men, struct file *file)
{
struct elf_note en;
@@ -1054,13 +1700,21 @@
}
#undef DUMP_WRITE
#undef DUMP_SEEK
+#endif
+#ifdef CONFIG_GZIP_COREDUMPS
+#define DUMP_GZ(addr, nr, crc, str) \
+ if ((size += (nr)) > limit || !gz_dump_write(file, (addr), (nr), (crc), (str))) \
+ goto end_coredump;
+#else
#define DUMP_WRITE(addr, nr) \
if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
goto end_coredump;
#define DUMP_SEEK(off) \
if (!dump_seek(file, (off))) \
goto end_coredump;
+#endif
+
/*
* Actual dumper
*
@@ -1085,6 +1739,41 @@
elf_fpregset_t fpu; /* NT_PRFPREG */
struct elf_prpsinfo psinfo; /* NT_PRPSINFO */
+#ifdef CONFIG_GZIP_COREDUMPS
+ z_stream gz_stream;
+ void *deflate_workspace;
+ __u32 crc = 0; /* init */
+ unsigned char gz_magic[10] = { /* gzip magic header */
+ 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 0x03 };
+ unsigned char *empty_buf;
+
+ deflate_workspace = vmalloc(zlib_deflate_workspacesize());
+ if (!deflate_workspace) {
+ printk(KERN_WARNING "Failed to allocate deflate workspace\n");
+ return -ENOMEM;
+ }
+
+ gz_stream.workspace = deflate_workspace;
+ if (Z_OK != zlib_deflateInit2(&gz_stream,
+ 7, /* compression level */
+ Z_DEFLATED,
+ -15, /* window bits */
+ 6, /* mem level */
+ Z_DEFAULT_STRATEGY)) {
+ printk(KERN_WARNING "deflateInit failed\n");
+ return -ENOMEM;
+ }
+
+ empty_buf = vmalloc(1024);
+ if (!empty_buf) {
+ printk(KERN_WARNING "Failed to allocate 1024 bytes for dummy buffer\n");
+ return -ENOMEM;
+ }
+ memset (empty_buf, 0, 1024);
+
+ crc = crc32 (0,0,0); /* init */
+#endif
+
/* first copy the parameters from user space */
memset(&psinfo, 0, sizeof(psinfo));
{
@@ -1154,7 +1843,15 @@
has_dumped = 1;
current->flags |= PF_DUMPCORE;
+#ifdef CONFIG_GZIP_COREDUMPS
+ /* write gzip header */
+ DUMP_WRITE(gz_magic, 10);
+
+ /* write elf header */
+ DUMP_GZ(&elf, sizeof(elf), &crc, &gz_stream);
+#else
DUMP_WRITE(&elf, sizeof(elf));
+#endif
offset += sizeof(elf); /* Elf header */
offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */
@@ -1239,7 +1936,12 @@
phdr.p_align = 0;
offset += phdr.p_filesz;
+
+#ifdef CONFIG_GZIP_COREDUMPS
+ DUMP_GZ(&phdr, sizeof(phdr), &crc, &gz_stream);
+#else
DUMP_WRITE(&phdr, sizeof(phdr));
+#endif
}
/* Page-align dumped data */
@@ -1264,14 +1966,27 @@
if (vma->vm_flags & VM_EXEC) phdr.p_flags |= PF_X;
phdr.p_align = ELF_EXEC_PAGESIZE;
+#ifdef CONFIG_GZIP_COREDUMPS
+ DUMP_GZ(&phdr, sizeof(phdr), &crc, &gz_stream);
+#else
DUMP_WRITE(&phdr, sizeof(phdr));
+#endif
}
- for(i = 0; i < numnote; i++)
+ for(i = 0; i < numnote; i++) {
+#ifdef CONFIG_GZIP_COREDUMPS
+ if (!writenote_gz(¬es[i], file, empty_buf, &crc, &gz_stream))
+ goto end_coredump;
+#else
if (!writenote(¬es[i], file))
goto end_coredump;
-
+#endif
+ }
+#ifdef CONFIG_GZIP_COREDUMPS
+ PAD_GZ (dataoff-gz_stream.total_in, empty_buf, &crc, &gz_stream);
+#else
DUMP_SEEK(dataoff);
+#endif
for(vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
unsigned long addr;
@@ -1290,16 +2005,28 @@
struct vm_area_struct *vma;
if (get_user_pages(current, current->mm, addr, 1, 0, 1,
- &page, &vma) <= 0) {
- DUMP_SEEK (file->f_pos + PAGE_SIZE);
+ &page, &vma) <= 0) {
+#ifdef CONFIG_GZIP_COREDUMPS
+ PAD_GZ(PAGE_SIZE, empty_buf, &crc, &gz_stream);
+#else
+ DUMP_SEEK (file->f_pos + PAGE_SIZE);
+#endif
} else {
- if (page == ZERO_PAGE(addr)) {
- DUMP_SEEK (file->f_pos + PAGE_SIZE);
+ if (page == ZERO_PAGE(addr)) {
+#ifdef CONFIG_GZIP_COREDUMPS
+ PAD_GZ(PAGE_SIZE, empty_buf, &crc, &gz_stream);
+#else
+ DUMP_SEEK (file->f_pos + PAGE_SIZE);
+#endif
} else {
void *kaddr;
flush_cache_page(vma, addr);
kaddr = kmap(page);
+#ifdef CONFIG_GZIP_COREDUMPS
+ DUMP_GZ(kaddr, PAGE_SIZE, &crc, &gz_stream);
+#else
DUMP_WRITE(kaddr, PAGE_SIZE);
+#endif
flush_page_to_ram(page);
kunmap(page);
}
@@ -1308,15 +2035,37 @@
}
}
+#ifndef CONFIG_GZIP_COREDUMPS
if ((off_t) file->f_pos != offset) {
/* Sanity check */
printk("elf_core_dump: file->f_pos (%ld) != offset (%ld)\n",
(off_t) file->f_pos, offset);
}
+#endif
- end_coredump:
+end_coredump:
+#ifdef CONFIG_GZIP_COREDUMPS
+ gz_finish (file, &gz_stream);
+ zlib_deflateEnd (&gz_stream);
+
+ gz_magic[0] = (crc & 0x000000FF);
+ gz_magic[1] = (crc & 0x0000FF00) >> 8;
+ gz_magic[2] = (crc & 0x00FF0000) >> 16;
+ gz_magic[3] = (crc & 0xFF000000) >> 24;
+ gz_magic[4] = (gz_stream.total_in & 0x000000FF);
+ gz_magic[5] = (gz_stream.total_in & 0x0000FF00) >> 8;
+ gz_magic[6] = (gz_stream.total_in & 0x00FF0000) >> 16;
+ gz_magic[7] = (gz_stream.total_in & 0xFF000000) >> 24;
+ dump_write (file, gz_magic, 8);
+#endif
set_fs(fs);
up_write(¤t->mm->mmap_sem);
+
+#ifdef CONFIG_GZIP_COREDUMPS
+ vfree (deflate_workspace);
+ vfree (empty_buf);
+#endif
+
return has_dumped;
}
#endif /* USE_ELF_CORE_DUMP */
diff -ur linux-2.4.28/lib/Config.in linux-2.4.28-patched/lib/Config.in
-- linux-2.4.28/lib/Config.in 2003-11-28 19:26:21.000000000 +0100
+++ linux-2.4.28-patched/lib/Config.in 2005-01-06 11:21:21.000000000 +0100
@@ -27,7 +27,8 @@
fi
fi
-if [ "$CONFIG_PPP_DEFLATE" = "y" -o \
+if [ "$CONFIG_GZIP_COREDUMPS" = "y" -o \
+ "$CONFIG_PPP_DEFLATE" = "y" -o \
"$CONFIG_CRYPTO_DEFLATE" = "y" -o \
"$CONFIG_JFFS2_FS" = "y" ]; then
define_tristate CONFIG_ZLIB_DEFLATE y
On Thu, 6 Jan 2005, Jan Frey wrote:
> Hi,
>
> I've written a patch for 2.4.28 kernel which enables writing of core
> dump files for ELF binaries in .gz format. This is interesting when
> using and debugging large binaries. In my case core files exceeded 1GB
> and got written via NFS...
> Anyhow, below patch is not really "beautiful", especially CRC looks
> quite annoying here. Consequently it is to be seen as "proof of concept"
> and I'm open for further discussion.
>
> Is anybody else interested in something like this at all?
>
> Regards,
> Jan
But that's what modules are for! It would nice to have a module
that could be inserted when the capability is needed. Certainly
you don't expect everybody to keep those unused CRC tables in
the kernel forever. Do you?
Cheers,
Dick Johnson
Penguin : Linux version 2.6.10 on an i686 machine (5537.79 BogoMips).
Notice : All mail here is now cached for review by Dictator Bush.
98.36% of all statistics are fiction.
In article <1105017578.28175.1.camel@borcx178>,
Jan Frey <[email protected]> wrote:
>I've written a patch for 2.4.28 kernel which enables writing of core
>dump files for ELF binaries in .gz format. This is interesting when
>using and debugging large binaries. In my case core files exceeded 1GB
>and got written via NFS...
>Anyhow, below patch is not really "beautiful", especially CRC looks
>quite annoying here.
>+/* This table is needed for efficient CRC32 calculation */
>+static const unsigned long crc_table[8][256] = {
>+ {
>+ 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
You know, this looks exactly the same as lib/crc32table.h ...
I'd consider using lib/crc32.c.
Mike.
>+/* This table is needed for efficient CRC32 calculation */
>+static const unsigned long crc_table[8][256] = {
>+ {
>+ 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
First, by using "unsigned long", you may be doubling the size on most 64 bit
platforms. Second, I'm pretty sure there is a standard implementation of
several CRCs already in the kernel - is there a reason not to use one of them
(e.g. a different polynomial)?
Hi,
I tried to use those "in-kernel" functions, but they seem to do little
different CRC calculations. Unfortunately I don't have any experiences
with CRC stuff, anyone able to help here?
Regards,
Jan
> >+/* This table is needed for efficient CRC32 calculation */
> >+static const unsigned long crc_table[8][256] = {
> >+ {
> >+ 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
>
> First, by using "unsigned long", you may be doubling the size on most 64 bit
> platforms. Second, I'm pretty sure there is a standard implementation of
> several CRCs already in the kernel - is there a reason not to use one of them
> (e.g. a different polynomial)?
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
On Thursday 13 January 2005 11:51, Jan Frey wrote:
> Hi,
>
> I tried to use those "in-kernel" functions, but they seem to do little
> different CRC calculations. Unfortunately I don't have any experiences
> with CRC stuff, anyone able to help here?
Do you know what polynomial you are trying to use? My first try wth Google
gets me to:
http://www.cyphercalc.com/crctool.htm#LookupTables
not to mention a bunch of free sources such as:
http://www.repairfaq.org/filipg/LINK/F_crc_v35.html
which even implies that the pkzip polynomial *is* the standard one. If you
really need the unrolled version for performance, at least use the right data
types and/or consider to compute the tables at run time:
http://gcc.gnu.org/ml/gcc-patches/2002-04/msg01097.html
Hi all,
now I managed to use lib/crc32. Obviously the patch looks a lot better
now!
Regards,
Jan
> Hi,
>
> I tried to use those "in-kernel" functions, but they seem to do little
> different CRC calculations. Unfortunately I don't have any experiences
> with CRC stuff, anyone able to help here?
>
> Regards,
> Jan
>
> > >+/* This table is needed for efficient CRC32 calculation */
> > >+static const unsigned long crc_table[8][256] = {
> > >+ {
> > >+ 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
> >
> > First, by using "unsigned long", you may be doubling the size on most 64 bit
> > platforms. Second, I'm pretty sure there is a standard implementation of
> > several CRCs already in the kernel - is there a reason not to use one of them
> > (e.g. a different polynomial)?
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > the body of a message to [email protected]
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at http://www.tux.org/lkml/
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/