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linux: __get_nprocs_sched: do not feed CPU_COUNT_S with garbage [BZ #28850]

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Pass the actual number of bytes returned by the kernel.

Fixes: 33099d72e4 ("linux: Simplify get_nprocs")
Reviewed-by: Dmitry V. Levin <ldv@altlinux.org>

(cherry picked from commit 97ba273b50)
This commit is contained in:
Gleb Fotengauer-Malinovskiy 2022-02-01 22:39:02 +00:00 committed by Dmitry V. Levin
parent 008003dc6e
commit 05c83ccaf5
2 changed files with 2 additions and 1 deletions
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1
NEWS
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@ -59,6 +59,7 @@ The following bugs are resolved with this release:
[28769] CVE-2021-3999: Off-by-one buffer overflow/underflow in getcwd()
[28770] CVE-2021-3998: Unexpected return value from realpath() for too long results
[28784] x86: crash in 32bit memset-sse2.s when the cache size can not be determined
[28850] linux: __get_nprocs_sched reads uninitialized memory from the stack
Version 2.34

2
sysdeps/unix/sysv/linux/getsysstats.c
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@ -45,7 +45,7 @@ __get_nprocs_sched (void)
int r = INTERNAL_SYSCALL_CALL (sched_getaffinity, 0, cpu_bits_size,
cpu_bits);
if (r > 0)
return CPU_COUNT_S (cpu_bits_size, (cpu_set_t*) cpu_bits);
return CPU_COUNT_S (r, (cpu_set_t*) cpu_bits);
else if (r == -EINVAL)
/* The input buffer is still not enough to store the number of cpus. This
is an arbitrary values assuming such systems should be rare and there