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| author |  Sergei Trofimovich <slyfox@gentoo.org>
| 2021-03-12 21:08:27 -0800 |
|---|---|---|
| committer |  Linus Torvalds <torvalds@linux-foundation.org>
| 2021-03-13 11:27:31 -0800 |
| commit | 61bf318eac2c13356f7bd1c6a05421ef504ccc8a (patch) | |
| tree | abb58df498b44a642920a4f8bc107910dc18b106 /mm/huge_memory.c | |
| parent | ia64: fix ia64_syscall_get_set_arguments() for break-based syscalls (diff) | |
| download | linux-61bf318eac2c13356f7bd1c6a05421ef504ccc8a.tar.gz linux-61bf318eac2c13356f7bd1c6a05421ef504ccc8a.tar.bz2 linux-61bf318eac2c13356f7bd1c6a05421ef504ccc8a.zip | |
ia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign
In https://bugs.gentoo.org/769614 Dmitry noticed that
`ptrace(PTRACE_GET_SYSCALL_INFO)` does not return error sign properly.
The bug is in mismatch between get/set errors:
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
return regs->r10 == -1 ? regs->r8:0;
}
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
return regs->r8;
}
static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
if (error) {
/* error < 0, but ia64 uses > 0 return value */
regs->r8 = -error;
regs->r10 = -1;
} else {
regs->r8 = val;
regs->r10 = 0;
}
}
Tested on v5.10 on rx3600 machine (ia64 9040 CPU).
Link: https://lkml.kernel.org/r/20210221002554.333076-2-slyfox@gentoo.org
Link: https://bugs.gentoo.org/769614
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Reported-by: Dmitry V. Levin <ldv@altlinux.org>
Reviewed-by: Dmitry V. Levin <ldv@altlinux.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
0 files changed, 0 insertions, 0 deletions