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Linux: Do not check unused bytes after sched_getattr in tst-sched_setattr

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Linux 6.13 was released with a change that overwrites those bytes.
This means that the check_unused subtest fails.

Update the manual accordingly.

Tested-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2025-01-20 09:57:09 +01:00
parent 89e61e96b7
commit b3a6bd625c
2 changed files with 3 additions and 14 deletions
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6
manual/resource.texi
View File

@ -1058,9 +1058,9 @@ available in the future.
Upon success, @code{@var{attr}->size} contains the size of the structure
version used by the kernel. Fields with offsets greater or equal to
@code{@var{attr}->size} are not updated by the kernel. To obtain
predictable values for unknown fields, use @code{memset} to set
all @var{size} bytes to zero prior to calling @code{sched_getattr}.
@code{@var{attr}->size} may not be overwritten by the kernel. To obtain
predictable values for unknown fields, use @code{memset} to set all
@var{size} bytes to zero prior to calling @code{sched_getattr}.
On failure, @code{sched_getattr} returns @math{-1} and sets @code{errno}.
If @code{errno} is @code{E2BIG}, this means that the buffer is not large

11
sysdeps/unix/sysv/linux/tst-sched_setattr.c
View File

@ -33,14 +33,6 @@ union
unsigned char padding[4096];
} u;
static void
check_unused (void)
{
TEST_VERIFY (u.attr.size < sizeof (u));
for (unsigned int i = u.attr.size; i < sizeof (u); ++i)
TEST_COMPARE (u.padding[i], 0xcc);
}
static int
do_test (void)
{
@ -53,7 +45,6 @@ do_test (void)
/* Compiler barrier to bypass write access attribute. */
volatile unsigned int size = sizeof (u);
TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0);
check_unused ();
TEST_COMPARE (sched_setattr (0, &u.attr, 0), 0); /* Apply unchanged. */
/* Try to switch to the SCHED_OTHER policy. */
@ -81,14 +72,12 @@ do_test (void)
memset (&u, 0xcc, sizeof (u));
TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0);
TEST_COMPARE (u.attr.sched_policy, SCHED_OTHER);
check_unused ();
/* Raise the niceless level to 19 and observe its effect. */
TEST_COMPARE (nice (19), 19);
TEST_COMPARE (sched_getattr (0, &u.attr, sizeof (u.attr), 0), 0);
TEST_COMPARE (u.attr.sched_policy, SCHED_OTHER);
TEST_COMPARE (u.attr.sched_nice, 19);
check_unused ();
/* Invalid buffer arguments result in EINVAL (not EFAULT). */
{