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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 d2e4d2a38e
commit a2f1675634
2 changed files with 2 additions and 1 deletions
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1
NEWS
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@@ -9,6 +9,7 @@ Version 2.35.1
The following bugs are resolved with this release:
[28850] linux: __get_nprocs_sched reads uninitialized memory from the stack
[28853] libc: tst-spawn6 changes current foreground process group
(breaks test isolation)

2
sysdeps/unix/sysv/linux/getsysstats.c
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@@ -44,7 +44,7 @@ __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