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| author | Nicholas Piggin <npiggin@gmail.com> | 2022-03-07 19:27:34 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-05-19 15:11:26 +0200 |
| commit | 2896b2dff49d0377e4372f470dcddbcb26f2be59 (patch) | |
| tree | 854ce287fc7cb79a46ba739fb5981a5a67f2a003 /arch/powerpc/kernel/signal.c | |
| parent | powerpc/64: Bump SIGSTKSZ and MINSIGSTKSZ (diff) | |
| download | linux-2896b2dff49d0377e4372f470dcddbcb26f2be59.tar.xz linux-2896b2dff49d0377e4372f470dcddbcb26f2be59.zip | |
powerpc/signal: Report minimum signal frame size to userspace via AT_MINSIGSTKSZ
Implement the AT_MINSIGSTKSZ AUXV entry, allowing userspace to
dynamically size stack allocations in a manner forward-compatible with
new processor state saved in the signal frame
For now these statically find the maximum signal frame size rather than
doing any runtime testing of features to minimise the size.
glibc 2.34 will take advantage of this, as will applications that use
use _SC_MINSIGSTKSZ and _SC_SIGSTKSZ.
Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
References: 94b07c1f8c39 ("arm64: signal: Report signal frame size to userspace via auxv")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220307182734.289289-2-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/signal.c')
| -rw-r--r-- | arch/powerpc/kernel/signal.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index f7f8620663c7..68a91e553e14 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -141,6 +141,21 @@ unsigned long copy_ckvsx_from_user(struct task_struct *task, int show_unhandled_signals = 1; +unsigned long get_min_sigframe_size(void) +{ + if (IS_ENABLED(CONFIG_PPC64)) + return get_min_sigframe_size_64(); + else + return get_min_sigframe_size_32(); +} + +#ifdef CONFIG_COMPAT +unsigned long get_min_sigframe_size_compat(void) +{ + return get_min_sigframe_size_32(); +} +#endif + /* * Allocate space for the signal frame */ |