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coredump: Do not lock during 'comm' reporting

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The 'comm' member will always be NUL terminated, and this is not
fast-path, so we can just perform a direct memcpy during a coredump
instead of potentially deadlocking while holding the task struct lock.

Reported-by: Vegard Nossum <vegard.nossum@oracle.com>
Closes: https://lore.kernel.org/all/d122ece6-3606-49de-ae4d-8da88846bef2@oracle.com
Fixes: c114e9948c2b ("coredump: Standartize and fix logging")
Tested-by: Vegard Nossum <vegard.nossum@oracle.com>
Link: https://lore.kernel.org/r/20240928210830.work.307-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook 2024-09-28 14:08:31 -07:00
parent 8cf0b93919
commit 200f091c95
1 changed files with 2 additions and 2 deletions
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4
include/linux/coredump.h
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@ -52,8 +52,8 @@ extern void do_coredump(const kernel_siginfo_t *siginfo);
#define __COREDUMP_PRINTK(Level, Format, ...) \
do { \
char comm[TASK_COMM_LEN]; \
\
get_task_comm(comm, current); \
/* This will always be NUL terminated. */ \
memcpy(comm, current->comm, sizeof(comm)); \
printk_ratelimited(Level "coredump: %d(%*pE): " Format "\n", \
task_tgid_vnr(current), (int)strlen(comm), comm, ##__VA_ARGS__); \
} while (0) \