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prlimit: Translate old_rlimit from RLIM64_INFINITY to RLIM_INFINITY [BZ #22678]

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prlimit called without a new value fails on 32-bit machines if any of
the soft or hard limits are infinity. This is because prlimit does not
translate old_rlimit from RLIM64_INFINITY to RLIM_INFINITY, but checks
that the value returned by the prlimit64 syscall fits into a 32-bit
value, like it is done for example in getrlimit. Note that on the
other hand new_rlimit is correctly translated from RLIM_INFINITY to
RLIM64_INFINITY before calling the syscall.

This patch fixes that.

Changelog:
	[BZ #22678]
	* sysdeps/unix/sysv/linux/prlimit.c (prlimit): Translate
	old_rlimit from RLIM64_INFINITY to RLIM_INFINITY.
This commit is contained in:
Aurelien Jarno 2018-01-05 20:34:10 +01:00
parent 8e900969db
commit 24731685c8
2 changed files with 15 additions and 6 deletions
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6
ChangeLog
View File

@ -1,3 +1,9 @@
2018-01-05 Aurelien Jarno <aurelien@aurel32.net>
[BZ #22678]
* sysdeps/unix/sysv/linux/prlimit.c (prlimit): Translate
old_rlimit from RLIM64_INFINITY to RLIM_INFINITY.
2018-01-05 Aurelien Jarno <aurelien@aurel32.net>
Adhemerval Zanella <adhemerval.zanella@linaro.org>

15
sysdeps/unix/sysv/linux/prlimit.c
View File

@ -50,21 +50,24 @@ prlimit (__pid_t pid, enum __rlimit_resource resource,
{
/* The prlimit64 syscall is ill-designed for 32-bit machines.
We have to provide a 32-bit variant since otherwise the LFS
system would not work. But what shall we do if the syscall
succeeds but the old values do not fit into a rlimit
structure? We cannot return an error because the operation
itself worked. Best is perhaps to return RLIM_INFINITY. */
system would not work. The infinity value can be translated,
but otherwise what shall we do if the syscall succeeds but the
old values do not fit into a rlimit structure? We cannot return
an error because the operation itself worked. Best is perhaps
to return RLIM_INFINITY. */
old_rlimit->rlim_cur = old_rlimit64_mem.rlim_cur;
if (old_rlimit->rlim_cur != old_rlimit64_mem.rlim_cur)
{
if (new_rlimit == NULL)
if ((new_rlimit == NULL)
&& (old_rlimit64_mem.rlim_cur != RLIM64_INFINITY))
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
old_rlimit->rlim_cur = RLIM_INFINITY;
}
old_rlimit->rlim_max = old_rlimit64_mem.rlim_max;
if (old_rlimit->rlim_max != old_rlimit64_mem.rlim_max)
{
if (new_rlimit == NULL)
if ((new_rlimit == NULL)
&& (old_rlimit64_mem.rlim_max != RLIM64_INFINITY))
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
old_rlimit->rlim_max = RLIM_INFINITY;
}