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Mitigation for "clone on sparc might fail with -EFAULT for no valid reason" (bz 31394)

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It seems the kernel can not deal with uncommitted stack space in the area intended
for the register window when executing the clone() system call. So create a nested
frame (proxy for the kernel frame) and flush it from the processor to memory to
force committing pages to the stack before invoking the system call.

Bug: https://www.mail-archive.com/debian-glibc@lists.debian.org/msg62592.html
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31394
See-also: https://lore.kernel.org/sparclinux/62f9be9d-a086-4134-9a9f-5df8822708af@mkarcher.dialup.fu-berlin.de/
Signed-off-by: Michael Karcher <sourceware-bugzilla@mkarcher.dialup.fu-berlin.de>
Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Michael Karcher 2024-07-28 15:30:57 +02:00 committed by Andreas K. Hüttel
parent aedbf08891
commit faeaa3bc9f
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GPG Key ID: DC2B16215ED5412A
2 changed files with 6 additions and 0 deletions
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3
sysdeps/unix/sysv/linux/sparc/sparc32/clone.S
View File

@ -28,6 +28,9 @@
.text
ENTRY (__clone)
save %sp,-96,%sp
save %sp,-96,%sp
flushw
restore
cfi_def_cfa_register(%fp)
cfi_window_save
cfi_register(%o7, %i7)

3
sysdeps/unix/sysv/linux/sparc/sparc64/clone.S
View File

@ -32,6 +32,9 @@
ENTRY (__clone)
save %sp, -192, %sp
save %sp, -192, %sp
flushw
restore
cfi_def_cfa_register(%fp)
cfi_window_save
cfi_register(%o7, %i7)