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linux: Remove shmmax check from tst-sysvshm-linux

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The shmmax expected value is tricky to check because kernel clamps it
to INT_MAX in two cases:

  1. Compat symbols with IPC_64, i.e, 32-bit binaries running on 64-bit
     kernels.

  2. Default symbol without IPC_64 (defined as IPC_OLD within Linux) and
     glibc always use IPC_64 for 32-bit ABIs (to support 64-bit time_t).
     It means that 32-bit binaries running on 32-bit kernels will not see
     shmmax being clamped.

And finding out whether the compat symbol is used would require checking
the underlying kernel against the current ABI.  The shmall and shmmni
already provided enough coverage.

Checked on x86_64-linux-gnu and i686-linux-gnu.  It should fix the
tst-sysvshm-linux failures on 32-bit kernels.
This commit is contained in:
Adhemerval Zanella 2021-02-02 09:55:50 -03:00
parent 6e02b3e932
commit 9132010785
1 changed files with 14 additions and 12 deletions
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26
sysdeps/unix/sysv/linux/tst-sysvshm-linux.c
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@ -122,18 +122,21 @@ do_test (void)
if (shmid == -1)
FAIL_EXIT1 ("shmget failed: %m");
/* It does not check shmmax because kernel clamp its value to INT_MAX for:
1. Compat symbols with IPC_64, i.e, 32-bit binaries running on 64-bit
kernels.
2. Default symbol without IPC_64 (defined as IPC_OLD within Linux) and
glibc always use IPC_64 for 32-bit ABIs (to support 64-bit time_t).
It means that 32-bit binaries running on 32-bit kernels will not see
shmmax being clamped.
And finding out whether the compat symbol is used would require checking
the underlying kernel against the current ABI. The shmall and shmmni
already provided enough coverage. */
struct test_shminfo tipcinfo;
{
uint64_t v = read_proc_file ("/proc/sys/kernel/shmmax");
#if LONG_MAX == INT_MAX
/* Kernel explicit clamp the value for shmmax on compat symbol (32-bit
binaries running on 64-bit kernels). */
if (sizeof (__syscall_ulong_t) == sizeof (unsigned long int)
&& v > INT_MAX)
v = INT_MAX;
#endif
tipcinfo.shmmax = v;
}
tipcinfo.shmall = read_proc_file ("/proc/sys/kernel/shmall");
tipcinfo.shmmni = read_proc_file ("/proc/sys/kernel/shmmni");
@ -152,7 +155,6 @@ do_test (void)
FAIL_EXIT1 ("shmctl with IPC_INFO failed: %m");
TEST_COMPARE (ipcinfo.shmall, tipcinfo.shmall);
TEST_COMPARE (ipcinfo.shmmax, tipcinfo.shmmax);
TEST_COMPARE (ipcinfo.shmmni, tipcinfo.shmmni);
}