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Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm

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Pull ARM fixes from Russell King:
 "Just two fixes: wire up the new system calls added during the last
  merge window, and fix another user access site"

* 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  ARM: alignment: fix alignment handling for uaccess changes
  ARM: wire up new syscalls
This commit is contained in:
Linus Torvalds 2015-09-27 06:48:48 -04:00
commit c905929ac9
4 changed files with 30 additions and 6 deletions
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2
arch/arm/include/asm/unistd.h
View File

@ -19,7 +19,7 @@
* This may need to be greater than __NR_last_syscall+1 in order to
* account for the padding in the syscall table
*/
#define __NR_syscalls (388)
#define __NR_syscalls (392)
/*
* *NOTE*: This is a ghost syscall private to the kernel. Only the

2
arch/arm/include/uapi/asm/unistd.h
View File

@ -414,6 +414,8 @@
#define __NR_memfd_create (__NR_SYSCALL_BASE+385)
#define __NR_bpf (__NR_SYSCALL_BASE+386)
#define __NR_execveat (__NR_SYSCALL_BASE+387)
#define __NR_userfaultfd (__NR_SYSCALL_BASE+388)
#define __NR_membarrier (__NR_SYSCALL_BASE+389)
/*
* The following SWIs are ARM private.

2
arch/arm/kernel/calls.S
View File

@ -397,6 +397,8 @@
/* 385 */ CALL(sys_memfd_create)
CALL(sys_bpf)
CALL(sys_execveat)
CALL(sys_userfaultfd)
CALL(sys_membarrier)
#ifndef syscalls_counted
.equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
#define syscalls_counted

30
arch/arm/mm/alignment.c
View File

@ -365,15 +365,21 @@ do_alignment_ldrhstrh(unsigned long addr, unsigned long instr, struct pt_regs *r
user:
if (LDST_L_BIT(instr)) {
unsigned long val;
unsigned int __ua_flags = uaccess_save_and_enable();
get16t_unaligned_check(val, addr);
uaccess_restore(__ua_flags);
/* signed half-word? */
if (instr & 0x40)
val = (signed long)((signed short) val);
regs->uregs[rd] = val;
} else
} else {
unsigned int __ua_flags = uaccess_save_and_enable();
put16t_unaligned_check(regs->uregs[rd], addr);
uaccess_restore(__ua_flags);
}
return TYPE_LDST;
@ -420,14 +426,21 @@ do_alignment_ldrdstrd(unsigned long addr, unsigned long instr,
user:
if (load) {
unsigned long val;
unsigned long val, val2;
unsigned int __ua_flags = uaccess_save_and_enable();
get32t_unaligned_check(val, addr);
get32t_unaligned_check(val2, addr + 4);
uaccess_restore(__ua_flags);
regs->uregs[rd] = val;
get32t_unaligned_check(val, addr + 4);
regs->uregs[rd2] = val;
regs->uregs[rd2] = val2;
} else {
unsigned int __ua_flags = uaccess_save_and_enable();
put32t_unaligned_check(regs->uregs[rd], addr);
put32t_unaligned_check(regs->uregs[rd2], addr + 4);
uaccess_restore(__ua_flags);
}
return TYPE_LDST;
@ -458,10 +471,15 @@ do_alignment_ldrstr(unsigned long addr, unsigned long instr, struct pt_regs *reg
trans:
if (LDST_L_BIT(instr)) {
unsigned int val;
unsigned int __ua_flags = uaccess_save_and_enable();
get32t_unaligned_check(val, addr);
uaccess_restore(__ua_flags);
regs->uregs[rd] = val;
} else
} else {
unsigned int __ua_flags = uaccess_save_and_enable();
put32t_unaligned_check(regs->uregs[rd], addr);
uaccess_restore(__ua_flags);
}
return TYPE_LDST;
fault:
@ -531,6 +549,7 @@ do_alignment_ldmstm(unsigned long addr, unsigned long instr, struct pt_regs *reg
#endif
if (user_mode(regs)) {
unsigned int __ua_flags = uaccess_save_and_enable();
for (regbits = REGMASK_BITS(instr), rd = 0; regbits;
regbits >>= 1, rd += 1)
if (regbits & 1) {
@ -542,6 +561,7 @@ do_alignment_ldmstm(unsigned long addr, unsigned long instr, struct pt_regs *reg
put32t_unaligned_check(regs->uregs[rd], eaddr);
eaddr += 4;
}
uaccess_restore(__ua_flags);
} else {
for (regbits = REGMASK_BITS(instr), rd = 0; regbits;
regbits >>= 1, rd += 1)