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| author | Neil Horman <nhorman@tuxdriver.com> | 2007-10-16 23:26:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:50 -0700 |
| commit | 323211371073ce4a99b6efc69379589d6a640d35 (patch) | |
| tree | d69c0b023cfa1afdc64e4de8bc27ec03195b8088 | |
| parent | 74aadce986052f20088c2678f589ea0e8d3a4b59 (diff) | |
| download | linux-323211371073ce4a99b6efc69379589d6a640d35.tar.gz linux-323211371073ce4a99b6efc69379589d6a640d35.tar.bz2 linux-323211371073ce4a99b6efc69379589d6a640d35.zip | |
core_pattern: fix up a few miscellaneous bugs
Fix do_coredump to detect a crash in the user mode helper process and abort
the attempt to recursively dump core to another copy of the helper process,
potentially ad-infinitum.
[akpm@linux-foundation.org: cleanups]
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Cc: <martin.pitt@ubuntu.com>
Cc: <wwoods@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/exec.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/fs/exec.c b/fs/exec.c index 6450157062ea..cbd183daaad4 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1762,14 +1762,27 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs) goto fail_unlock; if (ispipe) { - core_limit = RLIM_INFINITY; helper_argv = argv_split(GFP_KERNEL, corename+1, &helper_argc); /* Terminate the string before the first option */ delimit = strchr(corename, ' '); if (delimit) *delimit = '\0'; + delimit = strrchr(helper_argv[0], '/'); + if (delimit) + delimit++; + else + delimit = helper_argv[0]; + if (!strcmp(delimit, current->comm)) { + printk(KERN_NOTICE "Recursive core dump detected, " + "aborting\n"); + goto fail_unlock; + } + + core_limit = RLIM_INFINITY; + /* SIGPIPE can happen, but it's just never processed */ - if(call_usermodehelper_pipe(corename+1, helper_argv, NULL, &file)) { + if (call_usermodehelper_pipe(corename+1, helper_argv, NULL, + &file)) { printk(KERN_INFO "Core dump to %s pipe failed\n", corename); goto fail_unlock; |