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linux_sigreturn() loads the struct trapframe from l_sigcontext

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members, thus making a signed extension of 32 bit register
context. If the register is not touched in usermode between
return from signal and next syscall entry, the sign-extension
part of 64bit register is not cleared, causing
linux32_fetch_syscall_args() to read wrong values.

Use unsigned type for the registers in the linux sigcontext.

Reported by:	Jacob Frelinger <jacob.frelinger duke edu>, arundel
In collaboration with:	dchagin
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2011-01-27 21:45:38 +00:00
parent ddc850164c
commit 77185f473b
1 changed files with 22 additions and 22 deletions
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44
sys/amd64/linux32/linux.h
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@ -370,28 +370,28 @@ typedef struct {
/* The Linux sigcontext, pretty much a standard 386 trapframe. */
struct l_sigcontext {
l_int sc_gs;
l_int sc_fs;
l_int sc_es;
l_int sc_ds;
l_int sc_edi;
l_int sc_esi;
l_int sc_ebp;
l_int sc_esp;
l_int sc_ebx;
l_int sc_edx;
l_int sc_ecx;
l_int sc_eax;
l_int sc_trapno;
l_int sc_err;
l_int sc_eip;
l_int sc_cs;
l_int sc_eflags;
l_int sc_esp_at_signal;
l_int sc_ss;
l_int sc_387;
l_int sc_mask;
l_int sc_cr2;
l_uint sc_gs;
l_uint sc_fs;
l_uint sc_es;
l_uint sc_ds;
l_uint sc_edi;
l_uint sc_esi;
l_uint sc_ebp;
l_uint sc_esp;
l_uint sc_ebx;
l_uint sc_edx;
l_uint sc_ecx;
l_uint sc_eax;
l_uint sc_trapno;
l_uint sc_err;
l_uint sc_eip;
l_uint sc_cs;
l_uint sc_eflags;
l_uint sc_esp_at_signal;
l_uint sc_ss;
l_uint sc_387;
l_uint sc_mask;
l_uint sc_cr2;
} __packed;
struct l_ucontext {